How many pistols do you plan on locking up? I have a Jeep Grand Cherokee that I purchased a Gunvault Microvault
for. I did not bolt it down but did use the included security cable to secure it around a seat bracket. The Microvault can hold 2 of my pistols. A full size Kimber and a G30. I put the mags elsewhere. It can be bolted down it has mounting holes.
The thing that sold me on this was I can uncable the Microvault and use it for air travel as well.
Another place to look is Center of Mass
They sell the Gunvault Micro as well.